View Full Version : What is this stuff?

04-23-2008, 11:52 AM
Here's another one of those "what the heck is this stuff?" questions.

I started pulling the fiberglass off the bottom of Harry's boat and found some of Harry's "filler" near the bow. It is not flexible. I'm not sure how to deal with it. Remove it and replace it with something flexible...or glass back over it? My dream of having a fiberglass-free hull may be fading.

Any suggestions?




Jim Ledger
04-23-2008, 12:12 PM
Looks like Bondo to me.

Polyester auto body filler.

ron ll
04-23-2008, 02:18 PM
Isn't Bondo usually pink? Maybe not always. How about glazing putty? I know it gets really hard and brittle on old windows.

04-23-2008, 02:20 PM
polyester putty would be my guess.

Bob Adams
04-23-2008, 05:16 PM
Grey could be Marine Tex, which is an epoxy. There are grey polyesters however. If you pop a piece out, and break or cut it, the polyester aroma will be obvious.

04-23-2008, 06:40 PM
i.ve seen polyester body filler, pink, green, blue, grey, and yellow. i'd say cut some too, or sand it and take a whiff, if it's poly, you'll know. not looking at your pics, if it's kind of buff colored, it could be durham's rock hard wood filler, i've seen that used in a boat before.

04-24-2008, 10:52 PM
Thanks for all the ideas. I gave it a sniff test and it smells like nothing...except a bit of dust from my sanding of whatever is covering the hull (probably not polyester resin given the lack of smell - see the "I think it's epoxy and I know it has cracks" thread)

It's hard to smell through a respirator, I admit. But seriously, nothing smells of anything but wood. (which smells pretty damn good)

I'll be removing that filler which has not yet removed itself. My plan is to replace it with Pettit Seam Compound 7110 as this is what is recommended for preparing for their Hard Copper Bronze bottom paint. Any + or - thoughts on that?

Thanks again for all of your opinions.